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Huang X, Guo JY, Yang J, Xia Y, Zhang YF, Fu P, Du FP. High mechanical properties and ionic conductivity of polysiloxane sulfonate via tuning ionization degree with clicking chemical reaction. POLYMER 2022. [DOI: 10.1016/j.polymer.2022.125066] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Kao CH, Chen KL, Chen JR, Chen SM, Kuo YW, Lee ML, Lee LJH, Chen H. Comparison of Magnesium and Titanium Doping on Material Properties and pH Sensing Performance on Sb 2O 3 Membranes in Electrolyte-Insulator-Semiconductor Structure. MEMBRANES 2021; 12:25. [PMID: 35054551 PMCID: PMC8779276 DOI: 10.3390/membranes12010025] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2021] [Revised: 12/22/2021] [Accepted: 12/22/2021] [Indexed: 11/23/2022]
Abstract
In this research, electrolyte-insulator-semiconductor (EIS) capacitors with Sb2O3 sensing membranes were fabricated. The results indicate that Mg doping and Ti-doped Sb2O3 membranes with appropriate annealing had improved material quality and sensing performance. Multiple material characterizations and sensing measurements of Mg-doped and Ti doping on Sb2O3 sensing membranes were conducted, including of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS) and transmission electron microscopy (TEM). These detailed studies indicate that silicate and defects in the membrane could be suppressed by doping and annealing. Moreover, compactness enhancement, crystallization and grainization, which reinforced the surface sites on the membrane and boosted the sensing factor, could be achieved by doping and annealing. Among all of the samples, Mg doped membrane with annealing at 400 °C had the most preferable material properties and sensing behaviors. Mg-doped Sb2O3-based with appropriate annealing are promising for future industrial ionsensing devices and for possible integration with Sb2O3-based semiconductor devices.
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Affiliation(s)
- Chyuan-Haur Kao
- Department of Electronic Engineering, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan District, Tao Yuan City 333, Taiwan; (C.-H.K.); (K.-L.C.)
- Kidney Research Center, Department of Nephrology, Chang Gung Memorial Hospital, Chang Gung University, No. 5 Fuxing St., Guishan District, Taoyuan City 333, Taiwan
- Department of Electronic Engineering, Ming Chi University of Technology, 284 Gungjuan Rd., Taishan Dist., New Taipei City 243, Taiwan
| | - Kuan-Lin Chen
- Department of Electronic Engineering, Chang Gung University, 259 Wen-Hwa 1st Road, Kwei-Shan District, Tao Yuan City 333, Taiwan; (C.-H.K.); (K.-L.C.)
| | - Jun-Ru Chen
- Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, Puli 545, Taiwan; (J.-R.C.); (S.-M.C.)
| | - Shih-Ming Chen
- Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, Puli 545, Taiwan; (J.-R.C.); (S.-M.C.)
| | - Yaw-Wen Kuo
- Department of Electrical Engineering, National Chi Nan University, Puli 545, Taiwan;
| | - Ming-Ling Lee
- Department of Electro-Optical Enginnering, Minghsin University of Science and Technology, No.1, Xinxing Rd., Xinfeng 304, Taiwan
| | - Lukas Jyuhn-Hsiarn Lee
- National Institute of Environmental Health Sciences, National Health Research Institutes, Zhunan 350, Taiwan;
| | - Hsiang Chen
- Department of Applied Materials and Optoelectronic Engineering, National Chi Nan University, Puli 545, Taiwan; (J.-R.C.); (S.-M.C.)
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Label-Free Electrochemical Test of Protease Interaction with a Peptide Substrate Modified Gold Electrode. CHEMOSENSORS 2021. [DOI: 10.3390/chemosensors9080199] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
Abstract
Efficient deposition of biomolecules on the surface, maintaining their full activity and stability, is a most significant factor in biosensor construction. For this reason, more and more research is focused on the development of electrochemical biosensors that have the ability to electrically detect adsorbed molecules on electrode surface with high selectivity and sensitivity. The presented research aims to develop an efficient methodology that allows quantification of processes related to the evaluation of enzyme activity (proprotein convertase) using electrochemical methods. In this study we used impedance spectroscopy to investigate the immobilization of peptide substrate (Arg-Val-Arg-Arg) modified with 11-mercaptoundecanoic acid on the surface of gold electrode. Both the synthesis of the peptide substrate as well as the full electrochemical characteristics of the obtained electrode materials have been described. Experimental conditions, including concentration of peptide substrate immobilization, modification time, linker, and the presence of additional blocking groups have been optimized. The main advantages of the described method is that it makes it possible to observe the peptide substrate–enzyme interaction without the need to use fluorescent labels. This also allows observation of this interaction at a very low concentration. Both of these factors make this new technique competitive with the standard spectrofluorimetric method.
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Ivanoff CS, Wu JJ, Mirzajani H, Cheng C, Yuan Q, Kevorkyan S, Gaydarova R, Tomlekova D. AC electrokinetic drug delivery in dentistry using an interdigitated electrode assembly powered by inductive coupling. Biomed Microdevices 2017; 18:84. [PMID: 27565821 DOI: 10.1007/s10544-016-0111-x] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
AC electrokinetics (ACEK) has been shown to deliver certain drugs into human teeth more effectively than diffusion. However, using electrical wires to power intraoral ACEK devices poses risks to patients. The study demonstrates a novel interdigitated electrode arrays (IDE) assembly powered by inductive coupling to induce ACEK effects at appropriate frequencies to motivate drugs wirelessly. A signal generator produces the modulating signal, which multiplies with the carrier signal to produce the amplitude modulated (AM) signal. The AM signal goes through the inductive link to appear on the secondary coil, then rectified and filtered to dispose of its carrier signal, and the positive half of the modulating signal appears on the load. After characterizing the device, the device is validated under light microscopy by motivating carboxylate-modified microspheres, tetracycline, acetaminophen, benzocaine, lidocaine and carbamide peroxide particles with induced ACEK effects. The assembly is finally tested in a common dental bleaching application. After applying 35 % carbamide peroxide to human teeth topically or with the IDE at 1200 Hz, 5 Vpp for 20 min, spectrophotometric analysis showed that compared to diffusion, the IDE enhanced whitening in specular optic and specular optic excluded modes by 215 % and 194 % respectively. Carbamide peroxide absorbance by the ACEK group was two times greater than diffusion as measured by colorimetric oxidation-reduction and UV-Vis spectroscopy at 550 nm. The device motivates drugs of variable molecular weight and structure wirelessly. Wireless transport of drugs to intraoral targets under ACEK effects may potentially improve the efficacy and safety of drug delivery in dentistry.
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Affiliation(s)
- Chris S Ivanoff
- Department of Bioscience Research, College of Dentistry, University of Tennessee Health Science Center, 875 Union Avenue, Memphis, TN, 38163, USA. .,Faculty of Dental Medicine, Sofia Medical University, Blvd. Sveti Georgi Sofiiski №1, 1431, Sofia, Bulgaria.
| | - Jie Jayne Wu
- Department of Electrical Engineering and Computer Science, The University of Tennessee, Knoxville, 1520 Middle Drive, Knoxville, TN, 37966, USA
| | - Hadi Mirzajani
- Department of Electrical Engineering and Computer Science, The University of Tennessee, Knoxville, 1520 Middle Drive, Knoxville, TN, 37966, USA.,Department of Electrical Engineering, Microelectronics Research Laboratory, Sahand University of Technology, Tabriz, Iran
| | - Cheng Cheng
- Department of Electrical Engineering and Computer Science, The University of Tennessee, Knoxville, 1520 Middle Drive, Knoxville, TN, 37966, USA
| | - Quan Yuan
- Department of Electrical Engineering and Computer Science, The University of Tennessee, Knoxville, 1520 Middle Drive, Knoxville, TN, 37966, USA
| | - Stepan Kevorkyan
- Faculty of Dental Medicine, Medical University of Plovdiv, Blvd. Hristo Botev №3, 4002, Plovdiv, Bulgaria
| | - Radostina Gaydarova
- Faculty of Dental Medicine, Medical University of Plovdiv, Blvd. Hristo Botev №3, 4002, Plovdiv, Bulgaria
| | - Desislava Tomlekova
- Faculty of Dental Medicine, Medical University of Plovdiv, Blvd. Hristo Botev №3, 4002, Plovdiv, Bulgaria
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Cui H, Li S, Yuan Q, Wadhwa A, Eda S, Chambers M, Ashford R, Jiang H, Wu J. An AC electrokinetic impedance immunosensor for rapid detection of tuberculosis. Analyst 2013; 138:7188-96. [DOI: 10.1039/c3an01112g] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Henderson AP, Seetohul LN, Dean AK, Russell P, Pruneanu S, Ali Z. A novel isotherm, modeling self-assembled monolayer adsorption and structural changes. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2009; 25:931-938. [PMID: 19090669 DOI: 10.1021/la802677n] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/27/2023]
Abstract
Self-assembled monolayers (SAMs) have numerous applications, for example, engine wear inhibitors, surface profiling signal enhancement, nanostructure production, sensor production, and catalysis. The adsorbed SAM structure has a major impact on the properties of the outer monolayer surface which dictates the performance and viability of the SAM for individual applications. Substrate growth phases of SAMs have been extensively studied, and two structures have been identified. Initially, a lying down SAM structure is formed that evolves into a standing up structure. It is often critical to know how both structures form as a function of substrate immersion time to be able to design the properties of this structure. The formation of mercaptopropionic acid (MPA) SAMs on gold has been studied. Electrochemical impedance spectroscopy (EIS) was used to measure the adsorption isotherms at five temperatures in the range 4-40 degrees C. Infrared reflectance absorption spectroscopy (IRRAS) was also used, and the results show close agreement. A new monolayer adsorption isotherm is proposed which models SAM structure formation as a function of immersion time, representing all phases of SAM adsorption. This model represents a significant improvement on previous models based on Langmuir and Kisliuk adsorption isotherms that only model the fractional coverage of a surface with a SAM. The new model predicts the optimum immersion time taken for an MPA monolayer on gold to attain a surface saturated with MPA. It accounts for temperature effects on the rate of formation and the degree of monolayer disorder. It has potential for use in other SAM systems and may become the method of choice for modeling many instances of sequential substrate adsorption of two different structures, each of which exhibits different properties, as a function of immersion time.
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Affiliation(s)
- Andrew P Henderson
- School of Science and Technology, and Spartan Nano, University of Teesside, Middlesbrough, United Kingdom.
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